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Texas Instruments LM3677TL-2.5/NOPB
- Part No.:
- LM3677TL-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3677TL-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LM3677TL-2.5/NOPB from Texas Instruments is a fixed-output 2.5 V, 600 mA synchronous step-down DC-DC converter optimized for ultra-low-voltage circuits powered by a single Li-Ion cell (2.7 V to 5.5 V input). It delivers 90%+ efficiency in PWM mode, features automatic PFM/PWM mode switching, 3 MHz fixed switching frequency, and internal soft-start. It serves as the primary core voltage regulator in mobile phone baseband processors and camera modules.
For engineers reviewing the LM3677TL-2.5/NOPB datasheet, LM3677TL-2.5/NOPB pinout, LM3677TL-2.5/NOPB application, or LM3677TL-2.5/NOPB equivalent, key selection criteria include quiescent current (16 µA typ. in PFM), shutdown current (0.01 µA typ.), output voltage accuracy (±2.5%), thermal shutdown threshold (150°C typ.), and DSBGA package footprint compatibility with space-constrained portable designs.
Technical Context
The LM3677TL-2.5/NOPB implements a voltage-mode PWM controller with input voltage feed-forward compensation to maintain stable line regulation across its 2.7 V–5.5 V input range. Its internal 0.5 V reference and feedback network set the fixed 2.5 V output via resistor dividerless architecture - eliminating external resistors and reducing BOM count.
It integrates complementary PFET and NFET power switches with RDS(ON) of 350 mΩ (P) and 150 mΩ (N) at 3.6 V, enabling high-efficiency synchronous rectification. Mode transitions between PWM (≥80 mA load) and PFM (light-load) are fully autonomous and based on zero-current detection and peak switch current thresholds, not external control signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2.5% - eliminates need for external feedback resistors and simplifies layout in battery-powered systems. |
| Max Output Current | 600 mA - supports core logic rails for ARM-based application processors and image signal processors in smartphones. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-Ion (fully charged to 4.2 V, discharged to 2.7 V) without external pre-regulation. |
| Switching Frequency | 3 MHz (typ.) - enables use of sub-1 µH inductors and 0603/0805 ceramic capacitors, minimizing solution size to <20 mm². |
| Quiescent Current | 16 µA (typ.) in PFM mode - extends standby battery life in always-on sensor or RF subsystems. |
| Shutdown Current | 0.01 µA (typ.) - ensures negligible battery drain during system sleep or power-off states. |
| Thermal Shutdown | Activates at 150°C (typ.), releases at 130°C (typ.) - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM3677TL-2.5/NOPB is housed in a lead-free 5-bump DSBGA package (YZR0005), measuring 1.2 mm × 1.2 mm × 0.55 mm, with 0.4 mm pitch and bottom-side solderable bumps. This ultra-compact, low-profile package is optimized for thin mobile devices and requires no thermal pad or exposed die attach.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.7 V–5.5 V input; must be decoupled with ≥4.7 µF ceramic capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| SW | Switching node | Connects internally to PFET drain and NFET source; drives external 1.0 µH inductor; requires tight loop routing to minimize EMI and voltage overshoot. |
| FB | Feedback input | Not used in fixed-output LM3677TL-2.5/NOPB - internally connected to precision 0.5 V reference and output divider; no external components required. |
| EN | Enable control | Logic-compatible input: <0.4 V = shutdown (0.01 µA IQ), >1.0 V = active; must not float - tie to VIN or microcontroller GPIO with pull-up if unused. |
| GND | Power ground | Primary return path for input/output currents and IC bias; requires low-impedance connection to solid ground plane beneath DSBGA footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode, reduces conduction loss by >30% vs. asynchronous buck, and improves full-load efficiency to ≥90% at 2.5 V/300 mA. |
| Automatic PFM/PWM mode switching | Enables seamless transition between high-efficiency light-load operation (16 µA IQ) and low-noise, regulated heavy-load delivery (3 MHz fixed frequency), without firmware or external mode control. |
| Integrated soft-start | Ramps output voltage over ~200–300 µs (load-dependent) to limit inrush current into downstream capacitance, preventing input rail collapse during power-up. |
| Current-limit and thermal protection | Provides 1220 mA (typ.) cycle-by-cycle current limit and thermal shutdown at 150°C (typ.), ensuring robustness under short-circuit or high-ambient conditions without external circuitry. |
| Ultra-small solution size | Requires only three external passive components - 1.0 µH inductor + 4.7 µF input cap + 10 µF output cap - achieving total footprint <20 mm², ideal for camera modules and wearable sensors. |
Applications
| Mobile Phone Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powers ARM Cortex-A series application processor cores and memory interfaces in slim smartphone designs using single Li-Ion battery. IC Role / Device Role / Timing Role: Primary 2.5 V buck regulator delivering up to 600 mA with fast transient response to handle CPU burst loads. Use Value: 3 MHz switching enables compact 1.0 µH inductor and 0603 capacitors, reducing board area by >40% versus 1 MHz alternatives while maintaining ±2.5% output accuracy. | Use Scenario: Supplies image signal processor (ISP) and CMOS sensor interface logic in compact digital still cameras and smartphone camera modules. IC Role / Device Role / Timing Role: Fixed 2.5 V point-of-load regulator with low-noise PWM mode and automatic light-load PFM entry to extend battery runtime during preview mode. Use Value: 16 µA quiescent current in PFM mode extends standby time by >2× compared to non-PFM buck converters, critical for always-on camera wake-on-motion features. |
| Portable Media Player Audio Codec | WLAN Baseband Subsystem |
Use Scenario: Provides clean, low-noise 2.5 V rail for high-fidelity audio codec ICs in MP3 players and Bluetooth headphones. IC Role / Device Role / Timing Role: Synchronous buck converter operating in fixed-frequency PWM mode to avoid audible switching noise in audio band (<20 kHz). Use Value: Internal synchronous rectification and 3 MHz operation minimize output ripple (<15 mVPP), eliminating need for post-regulation LDO and reducing total power loss by ~180 mW at 200 mA. | Use Scenario: Powers WLAN MAC/baseband SoC in portable hotspot and tablet designs where thermal headroom is limited and battery life is critical. IC Role / Device Role / Timing Role: Efficient 2.5 V supply with integrated thermal shutdown and current limiting, supporting intermittent high-power TX bursts and long idle periods. Use Value: Automatic PFM-to-PWM transition at ~115 mA (VIN = 3.6 V) ensures immediate response to WLAN transmit events while sustaining 16 µA IQ during receive/idle, maximizing RF subsystem energy efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 2.5 V output, 600 mA, 3 MHz, but uses 6-pin USON (NGE0006A) - larger footprint (2.0 mm × 2.0 mm) and higher thermal resistance (117°C/W vs. 85°C/W). | Same functional role but requires PCB redesign due to different package and pinout; lacks DSBGA's ultra-thin profile. | Select when USON handling infrastructure exists and board height >0.55 mm is acceptable; avoid for space-constrained camera modules. |
| TPS62260DDCR | Adjustable output (0.6–5.5 V), 600 mA, 2.25 MHz, 6-pin SOT-23 - higher quiescent current (25 µA typ. in PFM) and no fixed 2.5 V variant. | Requires external feedback resistors and occupies more board area; suitable only if voltage flexibility outweighs BOM and layout simplicity. | Choose only if future designs require multiple output voltages; not a drop-in replacement for LM3677TL-2.5/NOPB's fixed 2.5 V function. |
Compared with TPS62231DRYR and TPS62260DDCR, LM3677TL-2.5/NOPB offers the smallest footprint (1.2 mm × 1.2 mm), lowest profile (0.55 mm), and lowest quiescent current (16 µA) in its class - making it uniquely suited for next-generation ultra-thin mobile imaging and wearable subsystems where board area and battery life are primary constraints.
Availability
LM3677TL-2.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, portable media players, WLAN baseband subsystems, and portable instrumentation requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LM3677TL-2.5/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of leadership in high-efficiency DC-DC conversion for portable electronics.
The LM3677 product line was engineered specifically for ultra-low-voltage, space-constrained battery-powered applications - delivering high efficiency, minimal external component count, and industry-leading integration in sub-2 mm² packages for mobile and imaging subsystems.
FAQ
What is the output voltage tolerance of LM3677TL-2.5/NOPB over temperature and load?
The LM3677TL-2.5/NOPB maintains a fixed 2.5 V output with ±2.5% accuracy across the full operating ambient temperature range (−30°C to +85°C) and load current range (0 mA to 600 mA), as specified in the Electrical Characteristics table under "Feedback Voltage (TL)" test condition. This tolerance includes initial accuracy, line regulation, load regulation, and temperature drift - verified under closed-loop conditions per TI SNVS502F datasheet Figure 10–14.
Does LM3677TL-2.5/NOPB require external feedback resistors?
No, LM3677TL-2.5/NOPB does not require external feedback resistors. It is a fixed-output variant with the feedback divider integrated internally to deliver precisely 2.5 V. The FB pin is internally connected and must not be externally biased or loaded - unlike adjustable versions such as LM3677ADJ, which require external R1/R2.
What is the recommended inductor value and saturation current rating for LM3677TL-2.5/NOPB?
Texas Instruments recommends a 1.0 µH shielded inductor with a saturation current rating ≥1375 mA (the device's maximum current limit) and DC resistance ≤0.15 Ω. Examples include FDK MIPSA2520D 1R0 and Murata LQM2HP 1R0. This ensures stable operation up to 600 mA load while avoiding inductor saturation under worst-case input/output conditions.
Can LM3677TL-2.5/NOPB operate from a 2.5 V input supply?
No - LM3677TL-2.5/NOPB requires a minimum input voltage of 2.7 V per its Absolute Maximum and Operating Ratings. At 2.5 V input, the device cannot regulate 2.5 V output due to dropout limitations of the internal PFET/NFET switches and control loop headroom. Operation below 2.7 V may result in unregulated output or shutdown.
How does the enable (EN) pin behavior affect system power sequencing with LM3677TL-2.5/NOPB?
The EN pin of LM3677TL-2.5/NOPB provides precise system-level control: pulling EN <0.4 V disables the converter and reduces supply current to 0.01 µA (typ.), while driving EN >1.0 V enables normal operation. TI recommends tying EN to a system PMIC or microcontroller GPIO with controlled ramp-up after VIN exceeds 2.7 V to ensure proper soft-start activation and prevent brown-out during power-up.
LM3677TL-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3677TL-2.5/NOPB FAQ
1.How can I place an order for LM3677TL-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3677TL-2.5/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3677TL-2.5/NOPB reliable?
The price and inventory of LM3677TL-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3677TL-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3677TL-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3677TL-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3677TL-2.5/NOPB?
LM3677TL-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3677TL-2.5/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3677TL-2.5/NOPB?
For technical support, including LM3677TL-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3677TL-2.5/NOPB requirements.
6.How does Aetrix verify that LM3677TL-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3677TL-2.5/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3677TL-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3677TL-2.5/NOPB?
All LM3677TL-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3677TL-2.5/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3677TL-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM3677TL-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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